Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2006-03-07
2006-03-07
Chang, Kent (Department: 2675)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S082000
Reexamination Certificate
active
07009603
ABSTRACT:
A method and apparatus for driving light emitting polymer (PolyLED) displays is provided. Because PolyLED displays exhibit high capacitance characteristics, pre-charge current is injected to bring the diode up to near its operating current prior to enabling the diode. Thus, time and power is not wasted charging and discharging the high capacitance that is inherent in PolyLED displays and life of the diodes are prolonged because the diodes are not required to swing the full voltage range during each cycle. In addition, since older diodes need more voltage to produce the same current thus the same light intensity as newer diodes, an embodiment of the present invention adds an adaptive power generation system that actively monitors and adjusts power as necessary in order to generate constant amount of light (i.e., constant current) from all the diodes in the display.
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Mietus Dave
Page Rich
Thompson Barry
Chang Kent
TDK Semiconductor, Corp.
The Hecker Law Group, PLC
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